Question about 2005 Chrysler Crossfire

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P2500 code ALTERNATOR INDICATOR ALWAYS ON

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You need put a new alternator.

Posted on May 07, 2013

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Posted on Jan 02, 2017

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1999 Deville 4.6. Not charging. Replaced 2 Alternators and plugs for the alternator. Is there a relay I'm missing?


Is there Battery voltage on the heavier gage wire on the back of the alternator ? Is the charging symbol light lit on the instrument cluster ? No relay invloved in charging system ! Computer controlled .

Charge Indicator Always On ?????????

Charge Indicator Inoperative ??????????

The above are both diagnostic flow charts

Install a scan tool.
Turn ON the ignition, with the engine OFF.
View the IPC Data List Input ALT L TERMINAL on the scan tool.
Does the scan tool display ON?

Your best bet take an have it diagnosed at a qualified repair shop .

Feb 17, 2017 | Cars & Trucks

1 Answer

P2500 starts but won't stay running


P2500 Generator Lamp/L-Terminal Circ Low

Indicator

This code indicates that a fault has been detected in the generator lamp control circuit. The PCM may have also detected an abnormal voltage reading from the vehicle battery, starting, or charging system.

Code Set Parameters

In the event of generator lamp control circuit fault, a trouble code will be stored and a service engine soon lamp will be illuminated. Some models require multiple drive cycles (as many as 8) with a failure in order for the service engine soon lamp to be illuminated and others will activate it on the initial failure.

Symptoms

This code indicates that a fault has been detected in the charging system circuit. The PCM may have also detected an abnormal voltage reading from the vehicle battery, starting, or charging system.

Common Causes

The most common cause of this code can be traced to a faulty alternator. Other causes could include a bad battery or starter, open or shorted wiring or battery cables, insufficient battery primary or secondary grounds, defective voltage regulator, corroded battery terminal ends, a faulty PCM (rare), a large battery drain, or a defective battery.

Common Misdiagnosis

Technicians report that batteries and starters are often replaced in error when the alternator is either not charging or overcharging. If the battery is discharged, charge it and test the vehicle charging system to make sure that it is operating properly.

Diagnosis

  • The starting/charging system is monitored by the PCM whenever the key is placed in the "ON" position, as is the generator lamp circuit for the instrument panel
  • When the engine is running, the PCM is programmed to anticipate between 13.8 and 14.4 volts from the charging system
  • If a voltage reading that either exceeds or underachieves, a code will be stored and a service engine soon lamp illuminated
  • Some vehicle models (especially Chrysler) also use the PCM to regulate charging system voltage
  • System voltage malfunctions related to the PCM are much more common in vehicles equipped with this type of system than in other systems. Before beginning your diagnosis, make sure that the battery is fully charged
  • If the battery fails to take or hold a charge, it should be replaced. Several tools will be instrumental in successfully diagnosing this code
  • A suitable OBD-II scanner (or code reader) and a digital volt/ohmmeter will be most helpful in performing a successful diagnosis
  • Begin with a visual inspection of all wiring and connectors
  • Repair or replace damaged, disconnected, shorted, or corroded wiring, connectors, and components as necessary
  • Always retest the system after repairs are completed to ensure success. If all system wiring, connectors, and components (Including fuses) appear to be in normal working order, connect the scanner (or code reader) to the diagnostic connector and record all stored codes and freeze frame data
  • This information can be extremely helpful in diagnosing intermittent conditions that may have contributed to this code being stored
  • Continue by clearing the code and operating the vehicle to see if it returns
  • This will help to determine whether or not the malfunction is intermittent
  • After the codes are cleared, test drive the vehicle to see if the code returns
  • If the code fails to immediately return, you may have an intermittent condition
  • Intermittent conditions can prove to be quite a challenge to diagnose and in extreme cases may have to be allowed to worsen before a correct diagnosis can be made
  • Continue with a visual inspection of the battery and battery cables
  • Should you find excessive corrosion on the battery terminals, suspect a poor battery connection
  • If this is the case, disconnect the battery cables from the battery (always disconnect the ground cable first and see manufacturer's recommendations for disconnecting/reconnecting the battery) and remove the corrosion from the battery posts and terminals
  • Reconnect the battery and retest the charging system
  • Connect the starting/charging system tester to the battery and perform a load test
  • If the battery fails the load test, replace it
  • If the battery passes the load test, leave the tester connected and start the engine
  • Observe the voltage readings on the tester and compare your findings with manufacturer's specifications
  • Replace starting/charging system components as required
  • Typical alternator output should read approximately 14 volts with the engine started and no accessories or lighting turned on
  • Leave the tester connected and use the amp probe to test the starter current draw
  • Compare your findings to manufacturer's specs and repair or replace starting system cables or other components as needed. The generator lamp circuit is used to activate a charging system indicator in the instrument panel if system voltage is abnormal
  • Voltage readings that are too low may indicate worn brushes in the alternator
  • High voltage readings may be indicative of a defective voltage regulator (usually integrated in the alternator but some are part of the PCM)
  • Before performing any continuity and resistance testing on the generator lamp circuit, be sure to disconnect the wiring from the instrument panel to prevent damage to system controllers and circuit boards
  • Consult the vehicle service manual for reference voltage readings and other precautions. If the starting/charging system are in proper working order, you will need to test secondary wiring
  • Disconnect the alternator connector and test all circuits using the digital volt/ohmmeter
  • If alternator wiring values are in line with acceptable specifications, disconnect the PCM connector and perform a continuity test on all system circuits
  • Compare actual findings with manufacturer's specifications and repair open or shorted electrical wiring as necessary. If the malfunction has still not been rectified, suspect a defective PCM.

Nov 09, 2016 | Cars & Trucks

1 Answer

My battery keeps draing alternator is fine


Any non-standard additions such as amplifiers? If so, it may be an installation issue. If that is not the case, could be a "connection issue" or a bad alternator (in spite of some indication it is fine). A multitude of devices tap the battery, brake lights, the light in the cab that you can manually set to "always on", etc..

http://askville.amazon.com/battery-alternator-draining/AnswerViewer.do?requestId=89630481

Jul 08, 2015 | 2008 Peugeot 308 1.4

1 Answer

I have constant power from starter to the alternator....as well as crank and no start


There is always constant power to the alternator because there is no residual magnetism in an alternator to produce current. If you have a spark (dead short) when you earth out the alternator body this would indicate a fault probably in a diode. However if the alternator is properly earthed through the mounting bolts then there would not be a spark just a flat battery. I suggest that you take it to an accredited auto electrician and have it checked out.

Jun 22, 2014 | 1999 Plymouth Breeze

2 Answers

Bmw x5 battery light stay on


Check your manual for what the battery light indicates. It is just a general light for the electrical....not always the battery.

Mar 26, 2014 | BMW X5 Cars & Trucks

1 Answer

P2500 AND P1668


there might be overcharging or less charging done to your battery ........leads to defective in diode

May 07, 2013 | 2005 Chrysler Crossfire

2 Answers

How to connect a new era alternator voltage regulator wiring diagram.Or a schematic diagram of the charging system.


knowing the color codes can be a great help..usually in 12v reg system,from the regulator there are 6 white wire having a stripe codes,blue means neutral,green means field,black means ground to body,white means hot wired to +12v,yellow means to bat charging indicator going to instrument panel and finally red means to ignition....and always secure the regulators case to ground.

Jul 19, 2011 | Isuzu i-Series Cars & Trucks

1 Answer

I should mention it's a Chevrolet Lumina APV 1991 that I'm referring to. What are the FIRST signs that the Alternator may be going bad? What does it mean when the battery indicator light goes off and on...


going off and on randomly either indicates there is a bad connection in the charging system somewhere or that the brushes inside the alternator are worn and are not always making contact.
It could also mean that any other internal alternator component is beginning to fail...either way, unless you know how to rebuild one it means that it needs replacement.
Before replacing anything though, check all connections and also belt tension. You can have a test done at most larger parts stores that includes a battery and charging rate analysis. (most do that free).

Nov 05, 2010 | Chevrolet Lumina APV Cars & Trucks

1 Answer

Battery dont get charge ,but alternator it is ok


Always check the fluid level in each of the battery cells and top up with distilled water as required.

Using a multimeter you can assess th health of your car battery and alternator:
  • With the engine off, measure the volatge at thebattery terminal: it should show 12.5+ volts, anything under or around 10.5 volts indicates a shorted damaged battery cell -> bad battery!
  • With the engine running, the voltage reading at the battery terminal should indicate around 13.8 volts and anything under 13.5 volts and over 14.5 volts indicates a bad alternator and/or alternator regulator.
Hope it helps!

Oct 03, 2010 | Chevrolet Astro Cars & Trucks

2 Answers

Charge light on.bought a new battery its dead.could it be a fuse or a bad alternator


your alternater is shot bring it it to napa and order a new one its a common problem

Dec 21, 2009 | 1986 Toyota Pickup 4WD

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